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You can use the Where keyword in LINQ to filter your result sets. You pass one or more Boolean expressions to this clause, and those elements whose evaluations result in true are returned as part of the query. LINQ also supports multiple Where clauses in a single query. You can combine Boolean expressions in your Where clause with And (&& in C#) and Or (|| in C#). For example, the following code returns all employees that work in the IT department and live in Redmond.
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Sample of Visual Basic Code Dim empQuery As IEnumerable(Of Employee) = From emp In employees Where emp.Department = "IT Department" And emp.City = "Redmond" Select emp Sample of C# Code IEnumerable<Employee> empQuery = from emp in employees where emp.Department == "IT Department" && emp.City == "Redmond" select emp;
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You can use the Order By keyword to indicate a sort order for the selected elements. Items will be sorted by their default comparer. In the following example, the type being sorted is a string. Therefore, items will be sorted from A to Z. You can add the Descending keyword to reverse the sort order.
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634 ChAPTER 11
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Connecting to and Querying Data with LINQ
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Sample of Visual Basic Code Dim empQuery As IEnumerable(Of Employee) = From emp In employees Order By emp.Department Select emp Sample of C# Code IEnumerable<Employee> empQuery = from emp in employees orderby emp.Department select emp;
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Grouping
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The Group keyword allows you to group returned results into separate lists. When you use the Group keyword, you actually return a list of lists. For example, if you were to group the employee list in the examples by department, you would get an object with three items, one for each department (IT Department, Marketing, and Human Resources). Each item in this list would contain a key. The key would be based on the unique group name (in this case, the department). The item would also contain a list of Employee objects in the group. Visual Basic and C# handle grouping differently. In C#, items are created as actual typed lists of lists. The following code shows an example. Notice that the query indicates a list (IEnumerable) of lists (IGrouping). Each IGrouping list contains a key and a list of Employee objects in the group. Notice too that you can iterate over the two lists by using a nested For Each loop.
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Sample of C# Code IEnumerable<IGrouping<string, Employee>> empQuery = from emp in employees group emp by emp.Department; foreach (IGrouping<string, Employee> group in empQuery) { Response.Write(group.Key); foreach (Employee e in group) { Response.Write(e.First); } }
Visual Basic has the same concept. However, it creates anonymous types based on your grouping. For example, in the following code, an anonymous type is created to hold each group. This type is given the department property based on the Group By department statement in the query. This same anonymous type also includes the EmployeeGroup property, which is based on the Into EmployeeGroup = Group statement. You can see that this makes it slightly easier to iterate over these nested lists.
Lesson 1: Getting Started with LINQ
ChAPTER 11
Sample of Visual Basic Code Dim empQuery = From emp In employees Group By department = emp.Department Into EmployeeGroup = Group For Each group In empQuery Response.Write(group.department) For Each e As Employee In group.EmployeeGroup Response.Write(e.First) Next Next
Joining
You can use the Join keyword to join data from two or more data sources. This data can be joined in the query and then returned as a new object. All joins created with the Join keyword are equivalent to INNER JOINs in SQL. The join combines the two data sources based on matching keys. For example, the following code joins both the employees list and the timesheets list based on the employee ID. A new, anonymous type is created that has the EmployeeId, EmployeeName, and VacationHours properties . Note that the results will be a row for each joined item. This means that if one employee has three timesheets there will be three rows in the results for that employee.
Sample of Visual Basic Code Dim empQuery = From emp In employees Join ts In timesheets On emp.ID Equals ts.EmployeeId Select EmployeeId = emp.ID, EmployeeName = (emp.First & " " & emp.Last), VacationHours = ts.HoursVacation Sample of C# Code var empQuery = from emp in employees join ts in timesheets on emp.ID equals ts.EmployeeId select new { EmployeeId=emp.ID, EmployeeName=emp.First + " " + emp.Last, VacationHours = ts.HoursVacation};
You can also group your joins into objects. In the following example, the timesheet object is placed in the tms variable. This variable is then added to the anonymous type. This results in a list of employees, each of which contains a property called VacationHours that contains a list of timesheets. In Visual Basic this is accomplished via the Group Join keyword, along with Into. In C#, all that is required is into. Notice too how you iterate over the results in a nested For Each loop.
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